新型Ni-P功能梯度镀层的磨损特性研究  

Wear Behavior of Electrodeposited Ni-PFunctionally Gradient Deposits

作　　者：王立平[1] 高燕[1] 薛群基[1] 徐洮[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室

出　　处：《摩擦学学报》2005年第4期294-297,共4页Tribology

基　　金：国家自然科学基金资助项目(50271080;50323007);国家863项目资助(2003AA305670).

摘　　要：采用电沉积技术在钢表面制备了Ni-P功能梯度镀层和不同磷含量的Ni-P镀层,对比考察了2种镀层的磨损性能.结果表明: 沿镀层厚度方向,梯度合金镀层具有较好的成分和结构梯度;Ni-P梯度镀层的耐磨性较均质单层Ni-P镀层提高近1～2倍;经过高温热处理后,Ni-P合金镀层的主要磨损机制为裂纹萌生和扩展以及微区脆性剥落等,在磨损过程中梯度结构能够有效地抑制裂纹的萌生和扩展,从而使梯度结构合金镀层耐磨性大幅提高.Ni-P functionally gradient deposits and Ni-P deposits with different P contents were deposited on steel substrates by electrodeposition method. The wear behaviour of two types of Ni-P deposits was investigated comparatively. Results indicated that the graded Ni-P deposits have better composition and structure gradients in the direction of thickness. After heat treatment, the wear resistance of Ni-P gradient deposit is 1-2 times higher than that of ungraded Ni-P deposits. Wear process of Ni-P deposits were characterized by micro-crack nucleation and propagation, brittle detachment. The formation and propagation of cracks within heat-treated Ni-P gradient deposits during the wear process were effectively inhibited due to the introduction of graded composition and structures and as a result, the wear resistance of Ni-P gradient deposits was improved greatly.

关 键 词：Ni—P合金 功能梯度镀层 磨损性能 

分 类 号：TQ174[化学工程—陶瓷工业] TH117.3[化学工程—硅酸盐工业]